Study of seasonal variations in the number of spotted seals at Lake Furen, Hokkaido

Watanabe Mitsuki, Kobayashi Mari, Aoki Michiaki, Kaimoto Tadashi, Nagashima Daiki

doi:10.20798/awhswhs.7.1_3

Bibliographic Information

Other Title

北海道風蓮湖におけるゴマフアザラシPhoca larghaの個体数の季節変動

Abstract

To understand the present status of spotted seals (Phoca largha) at Lake Furen in eastern Hokkaido, Japan, we investigated seasonal variations in the number from May to the month before the sea-ice season between 2012 and 2016. There were no differences in the seasonal variations of total spotted seal numbers at Lake Furen from 2012 to 2016, and the number of hauled-out seals alone increased until September and decreased from October. Since this trend in the numbers of hauled-out spotted seals at Lake Furen is the same at other summer habitats that have been reported, the haul-out periods of spotted seals are consistent at their various summer habitats. At Lake Furen, the number of hauled-out spotted seals and the tide have a strong relationship in analyses using generalized linear models; hauled-out seals were observed only when the tide was below 80 cm, but few were observed above that level. This study has also found that the tendency for numbers from October to increase above summer numbers indicates that there are more individuals that migrate as far south to Lake Furen in autumn prior to the arrival of sea-ice.

Journal

Wildlife and Human Society

Wildlife and Human Society 7 (1), 3-9, 2019

Association of Wildlife and Human Society

Keywords

Details 詳細情報について

CRID: 1390001277368169344

NII Article ID: 130007726583

DOI: 10.20798/awhswhs.7.1_3

ISSN: 24242365; 24240877

Text Lang: en

Data Source

JaLC
CiNii Articles

Abstract License Flag: Disallowed

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